Proto-Slavic *gromъ

→ Czech hrom (inherited)

→ Old Church Slavonic громъ (inherited)

→ Old Church Slavonic грьмѣти (inherited)

→ Ancient Greek χρόμαδος (cognate)

→ Ancient Greek χρόμος (cognate)

→ Ancient Greek χρεμετίζω (cognate)

→ Macedonian гром (inherited)

→ Polish grom (inherited)

→ Romanian pogrom (derived)

→ Russian гром (inherited)

→ Serbo-Croatian гром (inherited)

→ Serbo-Croatian grom (inherited)

→ Slovene grom (inherited)

→ Ukrainian грім (inherited)